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EWG's Tap Water Database — 2021 UPDATE

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Chromium (total)

CTWC - Shoreline Region-Guilford System

Chromium is a naturally occurring metal, but industrial uses can elevate its levels in water. One form, hexavalent chromium, causes cancer. Total chromium is not a good indicator of the amount of hexavalent chromium in drinking water.

MORE ABOUT THIS CONTAMINANT

 

54

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20140.0186 ppb362ND - 0.340 ppb
2015ND20ND
2016ND70ND
2017ND30ND
2018ND20ND
2019ND40ND

ppb = parts per billion

State and national drinking water standards and health guidelines

EPA Maximum Contaminant
Level (MCL) 100 ppb

The legal limit for total chromium, established in 1991, was based on a 1958 toxicity study in laboratory animals, and applies to both the less-toxic trivalent chromium and the more-toxic hexavalent chromium forms of this compound. This limit does not protect against the risk of cancer from ingestion of hexavalent chromium.

ppb = parts per billion

All test results

Date Lab ID Result
2014-01-29140130CWCEIOC1ND
2014-01-29140130CWCDIOC1ND
2014-02-10201402110107AMND
2014-02-10201402110093AMND
2014-02-10201402110109AMND
2014-02-11201402120674AMND
2014-02-11201402120438AMND
2014-02-11201402120405AMND
2014-02-11201402120573AMND
2014-02-11201402120403AMND
2014-02-24201402250182AMND
2014-03-052676IOC1ND
2014-03-052674IOC1ND
2014-03-052673IOC1ND
2014-03-052669IOC1ND
2014-04-08201404090427AMND
2014-04-08201404090510AMND
2014-05-21201405220417AMND
2014-05-21201405220336AMND
2014-06-128367IOC1ND
2014-06-128366IOC1ND
2014-08-04201408050418AMND
2014-08-04201408050412AMND
2014-08-04201408050337AMND
2014-08-04201408050384AMND
2014-08-13140915-0115IOC1ND
2014-08-13141007-0044IOC1ND
2014-08-13BG93593IOC1ND
2014-08-13BG93595IOC1ND
2014-08-25201408260368AMND
2014-08-25201408270547AMND
2014-08-26201408270836AMND
2014-08-26201408270840AMND
2014-08-26201408270820AMND
2014-11-18201411190581AM0.340 ppb
2014-11-18201411190387AM0.330 ppb
2015-02-12BH73178IOCRND
2015-02-12BH73177IOC1ND
2016-01-11BK50862IOC1ND
2016-01-11BK50864IOC1ND
2016-01-19BK54777IOC1ND
2016-01-27BK58355IOCRND
2016-01-27BK58354IOC1ND
2016-03-14BK78126IOC1ND
2016-06-01BN44892IOC1ND
2017-01-18BX31347IOC1ND
2017-03-08BX82062IOC1ND
2017-06-07BY34926IOCRND
2018-03-30CA11463IOCRND
2018-03-30CA11466IOC1ND
2019-01-30IOC1 200520057ND
2019-02-27IOCR 200523002ND
2019-06-24IOC1 200537625ND
2019-07-10IOC1 200539998ND